Circle Calculator — Flat Crochet Circle Increases

For dc (UK)/sc (US): 6 increases per round. For htr (UK)/hdc (US): 8. For tr (UK)/dc (US): 12. For dtr (UK)/tr (US): 16. These numbers correspond to the stitch height ratio and keep the circle flat.

Cupping means too few increases per round - try adding 1-2 more increases. Ruffling means too many increases - reduce by 1-2. Gauge variation is the usual cause. The standard numbers assume average tension; adjust for your own.

This calculator is for circles only. For ovals, use our Oval Calculator which starts with a foundation chain and increases at both ends. The principles are similar but ovals need a different starting structure.

Stagger the starting point of increases each round. Instead of always increasing above the previous increase, offset by 1-2 stitches. Some patterns use invisible increases or random placement for a truly round shape.

There is no theoretical maximum, but very large circles (over 50cm) may start to ruffle slightly as small tension variations accumulate. For large circles, blocking helps flatten the edges. Use stitch markers to track increase positions.